Leases - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Payments on Lease Obligations
Operating cash flows used for operating leases	$ 4,054	$ 3,499
Changes in operating assets and liabilities:
Changes in operating lease right-of-use assets	1,892	1,696
Changes in operating lease obligations	(2,485)	(1,966)
Operating lease right-of-use assets and liabilities	$ (593)	(270)
Right-Of-Use Assets Obtained in Exchange for Lease Obligations
Operating leases		$ 45,677